How many silver atoms are there in 3.78 g of silver?

2.16 x 10^22 I learnt this in high school so I know it right away

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

It is 4.92 e-4 sorry if i am wrong